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To work with complex or user-defined parameter types, you can use the property.
In your business object, creating methods with long parameter lists that map control values one-to-one to data store values can result in code that is not easily reusable.
You can specify a name, type, direction, and default value for each parameter.
Parameters that get values from a specific object, such as a control, session variable, or the user profile, require you to set additional properties.
A better practice is to encapsulate your data in a custom class and then pass an instance of the class as a parameter.
For example, a sort expression that identifies the Last Name and First Name columns as the columns to use for sorting would be "Last Name, First Name" for an ascending sort and "Last Name, First Name DESC" for a descending sort. However, you might be working with a business object method that takes one or more parameters typed as a complex or user-defined type.
property, and based additionally on the parameter names that make up the business object method's signature.
When you create methods in a business object, you must ensure that the parameter names and types accepted by the business object method match the parameter names and types that the collection; and so on.
Empty, or to some other actual value, before it will compile in C#, or run without exception in VB. Net, set [a = “something”] before you attempt to do anything with it. Strings and some other CTS types have a misconception of being value types, like Integers, and they are not.
A more complex example would be that you disposed of a class that maybe you use to access the database. But then, somewhere else, you tried to call a method of that class that used those objects that no longer exists.